Extension & loft conversion (Shepperton, Surrey)
The structural calculations behind this project, prepared by our engineers for building control.
Project Overview
Location
Shepperton, Surrey
Project Type
Extension & loft conversion
Structural Services
Detailed Calculations
Compliance
Building Regulations
Rear Extension & Loft Conversion – Shepperton, Surrey
This Shepperton home has been completely transformed with a large rear extension and loft conversion, creating a modern, open-plan living space designed for comfort, style, and functionality. The homeowners wanted to expand their ground floor to accommodate a spacious kitchen-diner and living area, while the loft conversion added valuable extra space upstairs.
To make this possible, PorthouseDean provided expert structural calculations, ensuring all elements were safe, structurally sound, and fully compliant with Building Control.
Creating a Bright & Spacious Home
The project focused on:
✅ A large open-plan kitchen & living space – Designed for modern family living
✅ Bi-fold doors opening onto the garden – Seamless indoor-outdoor connection
✅ A loft conversion for extra space – Maximising the property’s potential
✅ Structural steelwork & RSJs – Supporting wide openings and open-plan design
What we did
Our role in this transformation included:
✔ Structural calculations for the rear extension & loft conversion – Ensuring full stability
✔ Steel beam (RSJ) design – Supporting the large glazing and open-plan layout
✔ Load-bearing wall assessments – Creating a safe and well-integrated structure
✔ Foundation design – Ensuring the extension was built on a solid base
With these calculations in place, the homeowners now enjoy a bright, modern, and beautifully designed living space that enhances both comfort and functionality.
Planning a Home Extension? Let’s Make It Happen!
At PorthouseDean, we provide expert structural calculations for home extensions, loft conversions, RSJ beams, and open-plan renovations.
📍 Providing structural engineering across Shepperton, Staines, and Surrey.
Why Extend Your Home?
More Space, More Possibilities
Create an open-plan kitchen, a family hub, or a bright entertaining space.
A Date You Can Plan Around
You choose the delivery date, and the price follows the date.
More Natural Light
A wider opening to the garden needs a beam sized for the load above it. The calculations set that size.
Personalised Design
Every house is built differently. The calculations work from your drawings and the structure you already have.
How PorthouseDean Supports Your Project
Every project is different, but the need for precise, reliable structural calculations remains the same. Our engineers work with:
Homeowners
Ensuring designs are safe, cost-effective, and practical.
Architects
Providing calculations that allow for creative yet compliant designs.
Builders
Making sure construction runs smoothly with clear, reliable specifications.
Planning Your Own Project?
More than 9,000 projects since 2012 have run through the same process. You get a fixed price before you commit, and you choose the delivery date.
📩 Get a QuoteStructural Engineering Services We Offer
Structural Calculations for Loft Conversions
Calculations for the floor, beams and roof changes a loft conversion needs.
Structural Calculations for Wall Knock-Throughs
Beam and support calculations for taking out a wall.
Structural Calculations for Extensions & New Builds
Calculations for foundations, walls, beams and roofs on extensions and new builds.
Structural Calculations for Bi-Fold Doors & RSJs
Beam and padstone sizes for wide openings and bi-fold doors.
Structural Drawings & Building Control Calculations
Complete documentation to help you achieve smooth Building Control approvals.